Soft magnetic functions

The technical magnetic properties such as Hc and pi are primarily a function of the magnetocrystalline anisotropy constant (K ) of the material. But once the magnetocrystalline anisotropy has been made small, the soft magnetic properties are still limited by magneto-elastic anisotropies due to internal mechanical stress. Hence, materials development has focused on compositions and microstructures where both K and the saturation... 

Fig. A.3-23 Average grain size, coercivity and initial permeability of a nanocrystalline soft magnetic alloy as a function of the annealing temperature [3.23]...

Kirchberg S, Rudolph M, Ziegmann G, Peuker UA (2011) Nanocomposites based on technical polymers and sterically functionalized soft magnetic magnetite nanoparticles synthesis, processing and characterization. J Nanomater, Article ID 670531... 

It is clear that if the pendulum oscillates, the inductance L of the circuit is a function of the angle d, since the magnetic reluctance of the coil C varies because of the presence of the soft iron P. The first equation is the equation of an electric circuit to which is applied an e.m.f., E sin ad, subject to the condition that the inductance of this circuit is a function of d and has the frequency of the pendulum. 

Fig. 1.10 Soft rf pulses (left) in the shape of a sine (sin x/x) function, and their Fourier transforms (right), being equivalent to the excited slice in the presence of a constant magnetic field gradient. The well defined sine function (top) produces an excitation that is a slice...

This chapter gives an introduction to the basic concepts of magnetism in organic paramagnetic soft matter materials. Key concepts are emphasized using example case studies. Detailed analysis covers radicals functionalized with phenols and with benzimidazole functionalities, which induce various degrees of crystal self-assembly, depending on specific structures. A review with over 200 references and notes. 

Figure 4.34. Time-independent part of the orientation parameter as a function of the field frequency for different values of the internal magnetic anisotropy of the particles. The ratio e = TdAb = 1CT4 curves correspond to a = 100 (1), a = 10 (2), o = 5 (3), a = 2 (4), a = 0.1 (5). Thin lines a and b resemble the limiting behavior predicted by the rigid and soft dipole models, respectively. Note that at this graph the lines a and 1 visually coincide.

Verani and coworkers widely investigated stimuli-responsive soft materials with interesting optical and redox behaviors. Such materials are able to self-assembly in functional ordered structures, as Langmuir-Blodgett films and liquid crystals, and possess potential applications in molecular electronics and magnetic films as well. These compounds are mainly based on Co(II) (94), Co(III) (95), Cu(II) (96), Fe(II)/Fe(III) (97), and Ni (II) and Zn(II) (98). A recent overview dedicated to colloidal systems, and their application in different fields has recently appeared in the literature (99). 

---